Within the Neo World Program simulation, Kazuichi Sōda manifests as an illusory character originating from Nagito Komaeda's dream world, reflecting Kazuichi's pre-despair physical appearance. He sports signature hot pink layered hair partially concealed by a backward gray cap, thin eyes accentuated by hot pink prescription contact lenses, sharp teeth, and screw-shaped earrings. His attire consists of a bright blue mechanic jumpsuit partially unzipped over a plain white shirt.

This iteration retains Kazuichi's core enthusiastic and emotionally expressive personality, including his prominent fixation on Sonia Nevermind. A key divergence arises through Nagito Komaeda's influence: Sonia reciprocates Kazuichi's romantic feelings here, realizing his idealized scenario of mutual affection.

Kazuichi demonstrates a notably strong friendship with Nagito Komaeda and Fuyuhiko Kuzuryu. He voices open concern over Nagito's injuries, urging medical aid. After securing a date with Sonia, he eagerly shares the news with both friends; Nagito's tearful congratulations overwhelm Kazuichi but affirm their bond. When pre-date nerves compel Kazuichi to avoid the meeting, Nagito and Fuyuhiko intercept him. Nagito persuades Kazuichi to proceed by emphasizing inherent self-worth beyond talents, solidifying Kazuichi's trust in them.

The date unfolds at a school-campus café, where both express mutual enjoyment. Sonia later admires a photograph of them from her balcony, visibly pleased. This development halts abruptly when the entity known as the World Destroyer murders Kazuichi. His funeral draws Class 77-B attendees, spurring Sonia, Fuyuhiko, and Peko Pekoyama to pursue vengeance fueled by grief and anger.

Contrasting his established Ultimate Mechanic identity, this simulated version treats mechanics as a mere hobby without formal Ultimate recognition.